With Vice President Kamala Harris and her vice presidential running mate Gov. Tim Walz (D-MN) barnstorming the country this week with only 90 plus days to go before the election,Donald Trump will only be making one public appearance in Montana. On Friday the former president will take the stage at tiny Brick Breeden Fieldhouse on the campus of Montana State University, while Harris and Walz will be in Phoenix, followed by a Las Vegas rally on Saturday. As NBC-Montana is reporting, Trump last appeared in Montana in 2018 in four cities — two of which are still waiting on him to pay 6-year-old bi…